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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<div><a href="operator_q__q_s.html" title='cpp/chrono/operator""s'><span class="t-lines"><span>operator""s</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table">
<div><a href="operator_q__q_ms.html" title='cpp/chrono/operator""ms'><span class="t-lines"><span>operator""ms</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table">
<div><a href="operator_q__q_us.html" title='cpp/chrono/operator""us'><span class="t-lines"><span>operator""us</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table">
<div><a href="operator_q__q_ns.html" title='cpp/chrono/operator""ns'><span class="t-lines"><span>operator""ns</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<tr class="t-nv-h1"><td colspan="5"> Helper classes</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="treat_as_floating_point.html" title="cpp/chrono/treat as floating point"><span class="t-lines"><span>treat_as_floating_point</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration_values.html" title="cpp/chrono/duration values"><span class="t-lines"><span>duration_values</span></span></a></div></div></td></tr>
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<div></div>
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<div class="t-navbar-sep"> </div>
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<td> <div>Defined in header <code><a href="../header/chrono.html" title="cpp/header/chrono">&lt;chrono&gt;</a></code>
 </div>
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<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><br>
<p>    <span class="kw1">class</span> Rep, <br>
    <span class="kw1">class</span> Period <span class="sy1">=</span> <a href="../numeric/ratio/ratio.html"><span class="kw1224">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">1</span><span class="sy1">&gt;</span> <br>
</p>
<span class="sy1">&gt;</span> <span class="kw1">class</span> duration<span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
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<p>Class template <code>std::chrono::duration</code> represents a time interval. 
</p>
<p>It consists of a count of ticks of type <code>Rep</code> and a tick period, where the tick period is a compile-time rational constant representing the number of seconds from one tick to the next.
</p>
<p>The only data stored in a <code>duration</code> is a tick count of type <code>Rep</code>.  If <code>Rep</code> is floating point, then the <code>duration</code> can represent fractions of ticks.  <code>Period</code> is included as part of the duration's type, and is only used when converting between different durations.
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="duration.html%23Member_types"><span class="tocnumber">1</span> <span class="toctext">Member types</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="duration.html%23Member_functions"><span class="tocnumber">2</span> <span class="toctext">Member functions</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="duration.html%23Non-member_functions"><span class="tocnumber">3</span> <span class="toctext">Non-member functions</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="duration.html%23Helper_types"><span class="tocnumber">4</span> <span class="toctext">Helper types</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="duration.html%23Helper_classes"><span class="tocnumber">5</span> <span class="toctext">Helper classes</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="duration.html%23Literals"><span class="tocnumber">6</span> <span class="toctext">Literals</span></a></li>
<li class="toclevel-1 tocsection-7"><a href="duration.html%23Example"><span class="tocnumber">7</span> <span class="toctext">Example</span></a></li>
</ul>
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<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Member types">edit</a>]</span> <span class="mw-headline" id="Member_types">Member types</span>
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<td>  Member type
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<td>  Definition
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<td>  <code>rep</code>
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<td>  <code>Rep</code>, an arithmetic type representing the number of ticks
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<td>  <code>period</code>
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<td>  <code>Period</code>, a <span class="t-lc"><a href="../numeric/ratio/ratio.html" title="cpp/numeric/ratio/ratio">std::ratio</a></span> representing the tick period (i.e. the number of seconds per tick)
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<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Member functions">edit</a>]</span> <span class="mw-headline" id="Member_functions">Member functions</span>
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<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="duration/duration.html" title="cpp/chrono/duration/duration"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
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<td>  constructs new duration <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="duration/operator%3D.html" title="cpp/chrono/duration/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
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<td>   assigns the contents <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="duration/count.html" title="cpp/chrono/duration/count"> <span class="t-lines"><span>count</span></span></a></div></div>
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<td>   returns the count of ticks <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="duration/zero.html" title="cpp/chrono/duration/zero"> <span class="t-lines"><span>zero</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div>
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<td>   returns the special duration value zero <br> <span class="t-mark">(public static member function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="duration/min.html" title="cpp/chrono/duration/min"> <span class="t-lines"><span>min</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div>
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<td>   returns the special duration value min <br> <span class="t-mark">(public static member function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="duration/max.html" title="cpp/chrono/duration/max"> <span class="t-lines"><span>max</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div>
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<td>   returns the special duration value max <br> <span class="t-mark">(public static member function)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="duration/operator_arith.html" title="cpp/chrono/duration/operator arith"> <span class="t-lines"><span>operator+</span><span>operator-</span></span></a></div></div>
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<td>   implements unary + and unary - <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="duration/operator_arith2.html" title="cpp/chrono/duration/operator arith2"> <span class="t-lines"><span>operator++</span><span>operator++<span class="t-dsc-small">(int)</span></span><span>operator--</span><span>operator--<span class="t-dsc-small">(int)</span></span></span></a></div></div>
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<td>   increments or decrements the tick count <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="duration/operator_arith3.html" title="cpp/chrono/duration/operator arith3"> <span class="t-lines"><span>operator+=</span><span>operator-=</span><span>operator*=</span><span>operator/=</span><span>operator%=</span></span></a></div></div>
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<td>   implements compound assignment between two durations <br> <span class="t-mark">(public member function)</span> 
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<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Non-member functions">edit</a>]</span> <span class="mw-headline" id="Non-member_functions">Non-member functions</span>
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<td>  <div class="t-dsc-member-div"><div><a href="duration/common_type.html" title="cpp/chrono/duration/common type"> <span class="t-lines"><span>std::common_type<span class="t-dsc-small">&lt;std::chrono::duration&gt;</span></span></span></a></div></div>
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<td>   specializes the <span class="t-lc"><a href="../types/common_type.html" title="cpp/types/common type">std::common_type</a></span> trait <br> <span class="t-mark">(class template specialization)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="duration/operator_arith4.html" title="cpp/chrono/duration/operator arith4"> <span class="t-lines"><span>operator+</span><span>operator-</span><span>operator*</span><span>operator/</span><span>operator%</span></span></a></div></div>
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<td>   implements arithmetic operations with durations as arguments <br> <span class="t-mark">(function template)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="duration/operator_cmp.html" title="cpp/chrono/duration/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&lt;=</span><span>operator&gt;</span><span>operator&gt;=</span></span></a></div></div>
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<td>   compares two durations <br> <span class="t-mark">(function template)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="duration/duration_cast.html" title="cpp/chrono/duration/duration cast"> <span class="t-lines"><span>duration_cast</span></span></a></div></div>
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<td>   converts a duration to another, with a different tick interval <br> <span class="t-mark">(function template)</span> 
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<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Helper types">edit</a>]</span> <span class="mw-headline" id="Helper_types">Helper types</span>
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<td>  <span class="t-lc"><strong class="selflink">std::chrono::nanoseconds</strong></span>
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<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 64 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1228">std::<span class="me2">nano</span></span></a><span class="sy1">&gt;</span></span></span>
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<td>  <span class="t-lc"><strong class="selflink">std::chrono::microseconds</strong></span>
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<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 55 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1229">std::<span class="me2">micro</span></span></a><span class="sy1">&gt;</span></span></span>
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<td>  <span class="t-lc"><strong class="selflink">std::chrono::milliseconds</strong></span>
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<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 45 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1230">std::<span class="me2">milli</span></span></a><span class="sy1">&gt;</span></span></span>
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<td>  <span class="t-lc"><strong class="selflink">std::chrono::seconds</strong></span>
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<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 35 bits*/</span> <span class="sy1">&gt;</span></span></span>
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<td>  <span class="t-lc"><strong class="selflink">std::chrono::minutes</strong></span>
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<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 29 bits*/</span>,<a href="../numeric/ratio/ratio.html"><span class="kw1224">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">60</span><span class="sy1">&gt;&gt;</span></span></span>
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<td>  <span class="t-lc"><strong class="selflink">std::chrono::hours</strong></span>
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<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 23 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1224">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">3600</span><span class="sy1">&gt;&gt;</span></span></span>
</td>
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<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Helper classes">edit</a>]</span> <span class="mw-headline" id="Helper_classes">Helper classes</span>
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<td>  <div class="t-dsc-member-div"><div><a href="treat_as_floating_point.html" title="cpp/chrono/treat as floating point"> <span class="t-lines"><span>treat_as_floating_point</span></span></a></div></div>
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<td>   indicates that a duration is convertible to duration with different tick period  <br> <span class="t-mark">(class template)</span>
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<td>  <div class="t-dsc-member-div"><div><a href="duration_values.html" title="cpp/chrono/duration values"> <span class="t-lines"><span>duration_values</span></span></a></div></div>
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<td>   constructs zero, min, and max values of a tick count of given type <br> <span class="t-mark">(class template)</span>
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<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Literals">edit</a>]</span> <span class="mw-headline" id="Literals">Literals</span>
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<td colspan="2"> <div>Defined in inline namespace <code>std::literals::chrono_literals</code> </div>
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<td>  <div class="t-dsc-member-div">
<div><a href="operator_q__q_h.html" title='cpp/chrono/operator""h'> <span class="t-lines"><span>operator""h</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<td>   A <span class="t-lc"><strong class="selflink">std::chrono::duration</strong></span> literal representing hours  <br> <span class="t-mark">(function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="operator_q__q_min.html" title='cpp/chrono/operator""min'> <span class="t-lines"><span>operator""min</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<td>   A <span class="t-lc"><strong class="selflink">std::chrono::duration</strong></span> literal representing minutes  <br> <span class="t-mark">(function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="operator_q__q_s.html" title='cpp/chrono/operator""s'> <span class="t-lines"><span>operator""s</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<td>   A <span class="t-lc"><strong class="selflink">std::chrono::duration</strong></span> literal representing seconds  <br> <span class="t-mark">(function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="operator_q__q_ms.html" title='cpp/chrono/operator""ms'> <span class="t-lines"><span>operator""ms</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
</div>
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<td>   A <span class="t-lc"><strong class="selflink">std::chrono::duration</strong></span> literal representing milliseconds  <br> <span class="t-mark">(function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="operator_q__q_us.html" title='cpp/chrono/operator""us'> <span class="t-lines"><span>operator""us</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
</div>
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<td>   A <span class="t-lc"><strong class="selflink">std::chrono::duration</strong></span> literal representing microseconds  <br> <span class="t-mark">(function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="operator_q__q_ns.html" title='cpp/chrono/operator""ns'> <span class="t-lines"><span>operator""ns</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
</div>
</td>
<td>   A <span class="t-lc"><strong class="selflink">std::chrono::duration</strong></span> literal representing nanoseconds  <br> <span class="t-mark">(function)</span> 
</td>
</tr>
</table>
<p><br>
</p>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span>
</h3>
<div class="t-example">
<p> This example shows how to define several custom duration types and convert between types:
 </p>
<div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;chrono&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw1">typedef</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span><span class="sy1">&lt;</span><span class="kw4">int</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1224">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">1</span>, <span class="nu0">100000000</span><span class="sy1">&gt;&gt;</span> shakes<span class="sy4">;</span>
    <span class="kw1">typedef</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span><span class="sy1">&lt;</span><span class="kw4">int</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1231">std::<span class="me2">centi</span></span></a><span class="sy1">&gt;</span> jiffies<span class="sy4">;</span>
    <span class="kw1">typedef</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span><span class="sy1">&lt;</span><span class="kw4">float</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1224">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">12096</span>,<span class="nu0">10000</span><span class="sy1">&gt;&gt;</span> microfortnights<span class="sy4">;</span>
    <span class="kw1">typedef</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span><span class="sy1">&lt;</span><span class="kw4">float</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1224">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">3155</span>,<span class="nu0">1000</span><span class="sy1">&gt;&gt;</span> nanocenturies<span class="sy4">;</span>
 
    std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span> sec<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/basic_ostream.html"><span class="kw1432">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"1 second is:<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
    <a href="../io/basic_ostream.html"><span class="kw1432">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <a href="duration/duration_cast.html"><span class="kw837">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration_cast</span></span></a><span class="sy1">&lt;</span>shakes<span class="sy1">&gt;</span><span class="br0">(</span>sec<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="st0">" shakes<span class="es1">\n</span>"</span><span class="sy4">;</span>
    <a href="../io/basic_ostream.html"><span class="kw1432">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <a href="duration/duration_cast.html"><span class="kw837">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration_cast</span></span></a><span class="sy1">&lt;</span>jiffies<span class="sy1">&gt;</span><span class="br0">(</span>sec<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span>
              <span class="sy1">&lt;&lt;</span> <span class="st0">" jiffies<span class="es1">\n</span>"</span><span class="sy4">;</span>
    <a href="../io/basic_ostream.html"><span class="kw1432">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> microfortnights<span class="br0">(</span>sec<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">" microfortnights<span class="es1">\n</span>"</span><span class="sy4">;</span>
    <a href="../io/basic_ostream.html"><span class="kw1432">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> nanocenturies<span class="br0">(</span>sec<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">" nanocenturies<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">1 second is:
100000000 shakes
100 jiffies
0.82672 microfortnights
0.316957 nanocenturies</pre></div></div> 
</div>

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